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Rubber Products Compared

Edit:Rizhao Tongrui Rubber Products Co.,Ltd  Date:Oct 09, 2017

Rubber products refer to natural and synthetic rubber as raw materials to produce all kinds of rubber products activities, but also the use of waste rubber recycling of rubber products. Synthetic rubber production has been much higher than natural rubber, which is the largest production of styrene butadiene rubber.

characteristic

1. Rubber products molding, after a large pressure to suppress, due to the elastomer is not even within the cohesion can be eliminated, in the mold from the mold, often resulting in very unstable shrinkage (rubber shrinkage, due to different varieties of different ), Must go through a period of time before the gentle stability. Therefore, when a rubber product design at the beginning, regardless of formula or mold, must be carefully calculated with, if not, it is easy to produce product size instability, resulting in low quality products.

2. Rubber is a thermosetting thermosetting elastomer, plastic is hot and cold. Rubber due to the different types of sulfide, its molding curing temperature range, there is a considerable gap, even due to climate change, indoor temperature and humidity affected. Therefore, the production conditions of rubber products, need to be adjusted at any time, if not, it may produce product quality differences.

3. Rubber products are made of rubber raw materials made by the mixing of rubber refining compound made of raw materials, rubber in the rubber according to the characteristics of the required rubber products designed formula, and set the required product hardness. The product is molded and molded by a rubber flat vulcanizer. After the final product molding process, the product surface treatment smooth and no burr.

4. Rubber products aging test belongs to the aging test category, rubber aging refers to the rubber and products in the processing, storage and use of the process, due to the combination of internal and external factors caused by the performance of structural changes, and thus the loss of the use of value. Manifested as cracking, sticky, hardening, softening, powdering, discoloration, long mold and so on.

Products

Sponge rubber is a porous elastomer material, usually also known as foam rubber, foam rubber or microporous rubber, it is a porous structure with a variety of rubber in general. ASTM D1055 and ASTM D1056, respectively, the latex sponge and sponge were defined and classification, and developed a conventional physical properties of the determination method. The pores of this type of porous material should be defined throughout the material, according to the different structure of the hole, can be divided into obturator (between the hole and the hole between the hole), holes (holes and holes between the hole Completely separated, with a certain degree of concatenation) and mixed holes (both open and closed two structures) three. Accordingly, microporous rubber mainly includes both expansion rubber and sponge rubber. Due to the use of different habits, the domestic scientific and technological literature, "sponge rubber" does not mean the pores of the hole and the gap between the different institutions.

Structure and composition

Linear structure: Unspecified rubber structure. Due to the large molecular weight, no external force, was fine group. When the external force, the removal of external forces, fine group of entanglement changes, the molecular chain rebound, resulting in a strong tendency to restore, which is the origin of high elastic rubber.

Branches: The chains of rubber macromolecules are clustered to form gels. The gel is detrimental to the performance and processing of the rubber. In the rubber refining, a variety of complexing agent is often improved gel area, the formation of local blank, can not form reinforcement and cross-linking, as the weak parts of the product.

Crosslinking structure: linear molecules through some atoms or atomic groups of the bridge and connected to each other to form a three-dimensional network structure. With the progress of the vulcanization process, this structure has been strengthened. In this way, the free activity of the segment decreases, the plasticity and elongation decreases, the strength, the elasticity and the hardness rise, and the compression set and the degree of swelling decrease

Compared with the solid rubber, sponge rubber because of its structural characteristics, that is porous, it has a lot of special valuable performance, such as: ⑴, depending on the density of small, light material province; ⑵, flexible and soft (4), improve the ability to absorb the impact load, excellent buffer damping performance; ⑸, to improve the sound insulation, and improve the insulation performance, and have a low thermal conductivity; , Sound effects; ⑹, to improve the touch, improve comfort; ⑺, physical properties change range, change the visual density or cell structure can be the corresponding performance of sponge rubber. Therefore, sponge rubber products are widely used in sealing, shock absorption, insulation, noise, printing and dyeing and even ion exchange and many other aspects, in the aviation, automotive, instrumentation, instrumentation, home appliances and packaging industries are widely used. Its shape has plate, strip, tube, roller, washer, etc., specifications, different shapes. Different conditions of use require different pore structure and pore size. To this end, the requirements in the formulation design and processing technology to make the appropriate adjustments to achieve the appropriate use of performance.